> On Aug 9, 2015, at 11:10 AM, Konstantin Belousov <kostik...@gmail.com> wrote:
>
> On Sun, Aug 09, 2015 at 10:53:20AM -0700, Tim Kientzle wrote:
>>
>> I suspect the LOR is new.
>>
>> It looks like the panic is occurring when WITNESS tries to print the
>> backtrace for the LOR. I???m not familiar with that code; does it use the
>> kernel linker?
>>
>
> It indeed locks the linker lock to resolve symbols. So it seems to be
> even more useful to make the linker lock recursive locally, then you
> should be able to see the backtrace for LOR.
Changing the kld_sx lock to recursive, I now see a backtrace for the ufs/kernel
linker LOR. Full trace pasted below.
This is displayed just before the network interfaces; I suspect it’s being
triggered when my startup initializes the urtwn wireless adapter (which does
indeed load a number of kernel modules).
lock order reversal:
1st 0xc083ef40 kernel linker (kernel linker) @
/Users/tim/projects/crochet/src-head/sys/kern/kern_linker.c:1030
2nd 0xc2d63c94 ufs (ufs) @
/Users/tim/projects/crochet/src-head/sys/kern/vfs_lookup.c:529
KDB: stack backtrace:
db_trace_self() at db_trace_self
pc = 0xc0627ec0 lr = 0xc023fd34 (db_trace_self_wrapper+0x30)
sp = 0xde2be720 fp = 0xde2be838
r10 = 0xc069f42b
db_trace_self_wrapper() at db_trace_self_wrapper+0x30
pc = 0xc023fd34 lr = 0xc03eb0ec (witness_checkorder+0xf30)
sp = 0xde2be840 fp = 0xde2be888
r4 = 0xc2725be8 r5 = 0xc2d63c94
r6 = 0xc06ba387 r7 = 0xc069f42b
witness_checkorder() at witness_checkorder+0xf30
pc = 0xc03eb0ec lr = 0xc0375bcc (__lockmgr_args+0x24c)
sp = 0xde2be890 fp = 0xde2be8e8
r4 = 0xc2d63cb4 r5 = 0x00202400
r6 = 0x00000211 r7 = 0x00000000
r8 = 0xc2d63c94 r9 = 0x00000000
r10 = 0xc06ba387
__lockmgr_args() at __lockmgr_args+0x24c
pc = 0xc0375bcc lr = 0xc05db328 (ffs_lock+0x80)
sp = 0xde2be8f0 fp = 0xde2be920
r4 = 0xde2be948 r5 = 0x00202400
r6 = 0xc2d63c60 r7 = 0xc2d63c94
r8 = 0xc2d63cb4 r9 = 0x00000000
r10 = 0x00000008
ffs_lock() at ffs_lock+0x80
pc = 0xc05db328 lr = 0xc06609ec (VOP_LOCK1_APV+0x128)
sp = 0xde2be928 fp = 0xde2be940
r4 = 0xde2be948 r5 = 0xc07a9630
r6 = 0x00000000 r7 = 0x00202400
r8 = 0xde2be948 r9 = 0x00000211
r10 = 0xde2bed38
VOP_LOCK1_APV() at VOP_LOCK1_APV+0x128
pc = 0xc06609ec lr = 0xc044dcac (_vn_lock+0x48)
sp = 0xde2be948 fp = 0xde2be978
r4 = 0xc2d63c60 r5 = 0xde2bece0
r6 = 0xc06ba387 r10 = 0xde2bed38
_vn_lock() at _vn_lock+0x48
pc = 0xc044dcac lr = 0xc0433900 (lookup+0xf8)
sp = 0xde2be980 fp = 0xde2be9c8
r4 = 0xc2d63c60 r5 = 0xde2bece0
r6 = 0xde2bed50 r7 = 0x00000000
r8 = 0xde2bed50 r9 = 0xc306e448
r10 = 0xde2bed38
lookup() at lookup+0xf8
pc = 0xc0433900 lr = 0xc0433448 (namei+0x3e8)
sp = 0xde2be9d0 fp = 0xde2bea48
r4 = 0xde2bece0 r5 = 0x00000000
r6 = 0xde2bed50 r7 = 0x00000000
r8 = 0xc2e526a0 r9 = 0xc306e448
r10 = 0xde2bed38
namei() at namei+0x3e8
pc = 0xc0433448 lr = 0xc044d4b8 (vn_open_cred+0x1cc)
sp = 0xde2bea50 fp = 0xde2beb38
r4 = 0xde2bece0 r5 = 0x00000000
r6 = 0xc069f42d r7 = 0x00000001
r8 = 0x00000000 r9 = 0x00000000
r10 = 0xde2bed50
vn_open_cred() at vn_open_cred+0x1cc
pc = 0xc044d4b8 lr = 0xc044d2e4 (vn_open+0x24)
sp = 0xde2beb40 fp = 0xde2beb48
r4 = 0xde2bece0 r5 = 0xc2d0d3c0
r6 = 0xc069f42d r7 = 0x0000001a
r8 = 0x00000000 r9 = 0xc2e526a0
r10 = 0xc078d6f8
vn_open() at vn_open+0x24
pc = 0xc044d2e4 lr = 0xc0371390 (linker_load_module+0x634)
sp = 0xde2beb50 fp = 0xde2beda8
linker_load_module() at linker_load_module+0x634
pc = 0xc0371390 lr = 0xc0372ff4 (kern_kldload+0xc8)
sp = 0xde2bedb0 fp = 0xde2bedc8
r4 = 0xde2bedd4 r5 = 0xc083ef40
r6 = 0xc2e75000 r7 = 0x00000000
r8 = 0xde2bee00 r9 = 0xc306b380
r10 = 0xbfbff5fc
kern_kldload() at kern_kldload+0xc8
pc = 0xc0372ff4 lr = 0xc03730bc (sys_kldload+0x64)
sp = 0xde2bedd0 fp = 0xde2bede8
r4 = 0xc2e526a0 r5 = 0xc2e75000
r6 = 0x00000000 r7 = 0x00000000
sys_kldload() at sys_kldload+0x64
pc = 0xc03730bc lr = 0xc063e010 (swi_handler+0x2d4)
sp = 0xde2bedf0 fp = 0xde2bee50
r4 = 0xc2e526a0 r5 = 0x00000000
r6 = 0xc08b3d20 r10 = 0xbfbff5fc
swi_handler() at swi_handler+0x2d4
pc = 0xc063e010 lr = 0xc06294d8 (swi_exit)
sp = 0xde2bee58 fp = 0xbfbff648
r4 = 0x00000000 r5 = 0xbfbff600
r6 = 0xbfbff600 r7 = 0x00000130
r8 = 0xbfbff5e9 r9 = 0xbfbff5d9
r10 = 0xbfbff5fc
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